ABB REX 521 Technical Reference Manual, General

Also see for REX 521: Operator's manual Technical Reference Manual, General Operating guide Technical Reference Manual, Standard Configurations Technical Reference Manual, Standard Configurations

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ABB REX 521 Technical Reference Manual, General Manual pdf 13 page image

1MRS 751108-MUM REX 52113Protection RelayTechnical Reference Manual, General3. RequirementsIf the environmental conditions differ from those specified in section “Technicaldata” on page 44, as to temperature and humidity, or if the environmental conditionsaround the protection relay contain chemically active gases or dust, the relay shouldbe visually inspected in association with the secondary testing. The visual inspectionshould focus on:• Signs of mechanical damage to the relay case and terminals.• Signs of corrosion on terminals or on the case.• For information about the maintenance of relays, refer to section “Service” onpage 55.Protection relays are measuring instruments and should be handled withcare and protected against moisture and mechanical stress, especiallyduring transport.